How the James Webb Space Telescope Looks Back in Time
Webb sees the early universe because light takes time to travel and because expansion stretches it into the infrared. NASA explains the mirror, the sunshield and the record-setting galaxies.
Section
Science & Space
Space missions, computing research and the science behind the next generation of technology.
Nuclear Fusion Explained: Why It Is So Hard and What Progress Means
Fusion powers the Sun, and researchers want it on Earth. How it works, what the 2022 National Ignition Facility result did and did not show, and what ITER is for.
Quantum Computers Explained: What They Can and Cannot Do
Quantum computers use qubits to attack certain problems in new ways. What Google's error-correction result shows, what IBM promises for 2029, and why useful advantage is still unproven.
Reusable Rockets: How Boosters Land and Fly Again
Reusable rockets fly their first stage back to a landing, then fly it again. How a Falcon 9 landing unfolds, how the idea took hold, and what remains unproven.